Hey There!! Just a quick question for y'all... If I have a batch of 3ish week old chicks of different breeds, can I put them into a new coop with some 1ish year old hens (which I have not yet acquired) without the fear of disease from the older ones infecting the little ones? A few of my chicks died and I wanted to replenish my flock... but with older ones instead i have heard of Coccidiosis issues with different flocks, is that a valid fear? Thanks so much!!